the urban drool tool...“urban drool” • unnatural, unpermitted, non- exempted dry weather flows...

The Urban Drool Tool In ves tiga tin g un n atura l water ba lan ce

an d flow in Oran ge Coun ty

Overview

Managing Urban Drool:

• What? • Why? • How?

The Tool:

• For the public • For internal investigations

What?

“Urban Drool” • Unnatural, unpermitted, non-exempted dry weather flows • Increases with imperviousness • Carries urban increased pollutant loads • Inefficient water practices exacerbate it

Affects

• Water supply • Water balance • Water quality

(US EPA WaterSense)

Why?

Function-based framework for stream restoration adapted from Harman (2012) Interrelation of conditions in inland stream

systems in dry weather (WQIP, 2017)

How?

Non-structural BMPs • Awareness/Education • Incentives • Street sweeping

Structural BMPs

• Diversion • Capture • Treatment • Infiltration

The Making of the Tool

Publ ic-Facin g Applica tion

Search for address

Get personalized data for the census block

Visually see extent of water data and

stormwater drainage areas

Water Data by Census Block

Data granularity • Water usage data (~ 53,000 observations) • Total usage over budget : Tier 3, 4, 5 usage • Months of maximum and minimum usage • Identify areas of inefficient usage • Over budget customers: Typically customers with high outdoor water use

Census block characteristics • Number of homes

Household characteris tics

• Average household s ize • Average irrigated area

Rebate participation

• Turf replacement • Smart timers

Water Data by Census Block

Internal-Facin g Applica tion

Public tool layers · Outfall flow data · Water quality data · Asset management

A Targeted BMP Approach

Non-structural BMPs • Awareness/Education • Incentives • Street sweeping

Structural BMPs • Diversion • Capture • Treatment • Infiltration

• Combining available data into meaningful map overlays • Interactive maps that can educate public about local water use • Displays that can influence watershed management decisions • Adaptable to future enhancements and collaborations

Product Overview

Next Steps

Through the California Data Collaborative: • Expanding to more Water Districts within Orange County • Possibly expanding to other watershed management areas

Contact

Monobina Mukherjee Water Resources Analyst Moulton Niguel Water District MMukherjee@mnwd.com Amanda Aprahamian Environmental Resources Specialist County of Orange - OC Public Works Environmental Data Management Amanda.Aprahamian@ocpw.ocgov.com